Concrete mixer



Gf A. BONELLI.

CONCRETE MIXER.

APPLICATION FILED NOV.l8.192|.

Patented Nov. 28; 1922 2 SHEETS- SHEET I.

, [IZVQ/ZZ'U/f v G. A. BONELLI.

CONCRETE MIXER.

APPLICATION FILED NOVJB, 1921.

Patented Nov. 28, 1922.

2 SHEETSSHEET 2.

[h a/afar: 6'80 1 jazzed? Patented av. 28, 12.

GEORGE A. BONELLI, OF KINGMAN, ARIZONA.

cononn'rn MER.

Application filed November 18, 1921. Serial Ito. 516,093.

To all whom it may concern:

Be it known that I, GEORGE A. BONELLI, a citizen of the United States, residing at Kingman, in the county of Mohave and State of Arizona, have invented new and useful Improvements .in- Concrete Mixers, of which the following is a specification.

My invention relates to concrete mixers, and a purpose of my invention is the provision of a mixer includin amixing drum mounted 'tobe readily t ted for eifecting the discharge ofthe contents of the drum and mixing elements rotatable within the drum and adjustable to occupy various positions for efiecting the'thorough intermixing of the ingredients comprised in the concrete, and to facilitate the discharging of the material from the drum J It is also a purpose of my invention to provide a concrete mixer of simple, durable and efiicient construction and which is readily applicable to a motor vehicle chassis.

' I will describe two forms of concrete mixers embodying my invention, and will then point out the novel features .thereof in claims.

- In the accompanying drawings,

Figure 1 is a view showing in side elevation one form of mixer embodying my invention.

Fig. 2 isa top plan view of Fig. 1-.

Fig. 3 is an enlarged detail fragmentary View showing one of the mixing blades and the mechanism for efiecting adjustment thereof.

Fig. 4 is a top plan view of Fig. 3.

Fig. 5'is a view showing in side elevation, a portion of the adjusting mechanism shown in Fig. 1.

Fig. 6 is a View showing in side elevation, and partly in section, a portion of the drivin' mechanism for the mixing elements.

Fig. 7 is a view showing in side elevation a motor vehicle having applied thereto the concrete mixer shown in Figs. 1 and 2.

Similar reference characters refer to similar parts in each of the several views.

Referring specifically to the drawings and particularly to Figs. -1 and 2, my invention, in its present embodiment, comprises a frame F which is mounted for movement upon three wheels designated at W, W and W such wheels being arranged at the points of a triangle and including stub axles rotatably fitted in the frame for allowing of universal movement of the wheels. The stub axle 15 for the wheel W is mounted in' the pointed end of the frame and is adapted to have a sliding fit therein to allow of a vertical adjustment of the frame thereon, this arrangement being for the purpose of allowing of a tilting of a mixing drum D sustained on the frame. -The frame F is normally held in elevated position at its forward end by a lever 16 which engages the upper end of the stub axle 15, and thereby prevents upward movement of the axle and consequentl downward movement of the frame. A atch'lti engages the lever 16 to normally hold the latter in horizontal position. and to thereby depress the stub axle 15 so as to maintain the forward end of the frame in horizontal position.

The mixer itself comprises the drum D arranged above the frame and provided at diametrically opposite points with depending brackets 17 which are rotatably sustained on pintles 18 secured in the frame F and so arranged as to allow the tilting of the drum about the pintles as an axis. The drum is provided with a discharge opening at its forward end controlled by a door 19, and seeured'to the drum adjacent the door is a spout 20 for directin the material as it is discharged from the rum.

As illustrated in Fig. 6, a shaft 21 is journaled axially within the bottom of the drum D with its lower end provided with a bevel gear 22 meshing with a similar gear 23 fixed to a stub shaft 24. The gear 23 in turn meshes with a bevel gear 25 fixed to one end of a shaft 26. The shaft 26 ex tends to a point to one side of the drum where it is provided with a pulley 27 operatively connected to a pulley 28 by an endless belt 29. Thepulley 28 is fixed to the shaft 30 of a gasoline engine or other suitable form of motor which is sustained on one corner of the frame F. I

The upper end of the shaft 21 is formed with a squared extension 31 upon which is removably fitted a head 32 carrying a pair of mixin elements designated generally at M and 151'. These mixing elements each comprise a bar 33, one end-of which is fitted the head 32 so that the latter sustains the bar in horizontal position within the drum. As shown in Figs. '2 and 4, the bar 33 is provided at intervals with openings in and secured in a suitable recess formed in which are rotatably fitted shafts 34 having radially extending pins 35 working in slots 36 of a connecting rod 37. As shown in Fig. 3, the lower end of each shaft 34 carries a mixing blade 38 which may be made of the form shown, or any other suitable form, such as a disc or the like.-

As shown in Fig. 1, the mixin element M or M includes two sets of sha ts 34 and two sets of blades 38. The shafts of oneset are provided with a separate operating rod 37 operatively connected to all of the shafts by the pin and slot connections 35 and 36. As shown in Fig. 2, the pins 35 of one set are arranged oppositely with respect to the pins of the other set so that it is necessary to dispose the operatin sets adjacent the opposlte edges of the bar 33. As shown in Fig. 4, the outer ends of the rods37 are operatively connected to actuating levers 39 fulcrumed at the points 40 upon brackets 41 secured tothe bar 33. These, levers are adapted to be locked in any adjusted position by the segmental racks 42 and the locking rods 43 operated by'the levers 44 mounted in the handles of the levers 39.

.From the foregoing construction it will be clear that movement of the actuating levers 39 about the pivot points 40 effects a longitudinal movement of the rods 37 there-i by causinga simultaneous rotation of the several shafts 34 so as to vary the positions of the blades 38. As the actuating mechanism for one set of blades can be operated independently of the mechanism for the other blades, it will be clear that an adjustment of one set can be effected independentl of the other. As shown in Fig. 1, the blaciias of one set are oppositely inclined with respect to the blades of the other set, the purpose of this arrangement being to effect the co-action of the two sets of blades in directing the material contained in the drum either to a oint between the two sets of blades orv to t e periphery of the drum. I

In practice, continuous rotation of the head 32 is effected throu h the operative ait 21 and the motor shaft 30. With rotation of the head 32, bodily rotation of the bars 33 is efiect'ed to move the seyeral sets of blades-concentri: cally of the drum, with the blade of each set .describin a separate path through the mathe blades of one element are so arranged,

it willbe clear that the inclination of the blades causes a concentration of the material at a: point between the two sets of blades rod 37 for the two I) which, by virtue of the continuous rotation of the mixing elements, effects a thorough intermixing of the ingredients. .Durin the mixing operation the blades of both mixing elements are arranged as just described, but when it is desired to discharge the material from the drum, the blades are adjusted so that the blades of both elements extend in the same direction, or in such a direction 7 that during their travel they will move the material to the periphery of the drum.

By virtue of the mechanism previously described, it will be clear that thevdrum can be tilted so as to effect the discharge of concrete intothe spout 30. It is to be particularly noted that the tilting axis of the drum is in alinement with the axis of rotation of the shaft 24, the purpose of this arrangement bein to maintain the gears 25 and 23 in mesh w1th each other when the drum is tilted, and to thereby. continue the operative connection between the shaft 21 and the shaft 30 so that the rotation of the mixing elements may be continued with the drum in tilted position." It willtherefore be seen that with the blades 38 adjusted to move the material to the periphery of the drum, that the discharging of the material, will be efi'ected.

In Fig. 5 I have shown a slightly modified form of mechanismfor adjustingthe blades 38. In this embodiment, each shaft 34 is provided at its. upper end with an arm 45 1'11 which is fitted a pin 46 connected to an actuating rod 47, the rod and pin being arranged above the shaft so that upon longitudinal movement of the rod, rotation of the shaft 34 is efiected.

Referring now to Fig. 7, I have here shown the concrete mixer as applied to a motor vehicle, and the latter is of conven tional form with the exception that the rear end of the chassis is inclined as indicated at 48 to allow he tilting of the drum D. The drum D is mounted for tilting movement in the same manner as described in connection with the first embodiment of my invention, so that actuation of the mixing elements can be efi'ected while the drum is in tilted position.

The actuatin mechanism for the mixing elements inclu es a shaft 49 which corresponds to the shaft 26, such shaft being operatively connected toa shaft 50 throu h a pulley and belt connection 51. The s aft 50 is supported beneath the chassis in bearings 52 with its forward end provided with a pulley 53 which is adapted to be operatively connected to a pulley 54 fixed to a shaft 55, the latter constituting an extension of the motor shaft of the vehicle. An endless belt 56 operatively connects the pulleys 53 and 54, and this belt may be shifted to an idle pulley 57 to disconnect the vehicle motor from the shaft 50.

The drum is normally secured in horimama:

'zontal position upon the chassis by a latch member 58 which, as shown, is conveniently Although I have herein shown and de-- scribed only two forms of concrete mixers understood that various changes and modi fications may be made herein without departing from the spirit of the invention and the spirit and scope of the appended claims.

What I claim is:

1. A concrete mixer comprising a receptacle, mixing elements rotatable within the receptacle, each of said elements comprising two sets of blades with the blades of each set movable to occupy various angular positions with relation to one wall of the receptacle, and means for adjusting said blades so that the blades of one set co-operate with the blades of the other set in effecting a dis charge of the material from the receptacle or an intermixing of the material within the receptacle.

2. In a concrete mixer, a frame of substantially triangular formation, wheels arranged at the points of the triangle and including stub axles rotatably fitted in the frame, a mixing drum mounted for tilting movement upon the frame, a lever fulcrumed on the frame and engageable with:

one of the stub axles for maintaing the forward end of the frame in elevated position, and a latch engageable with the lever for retaining the latter in engagement with the stub axle.

3. A concrete mixer comprising a drum, and a mixing element rotatable within the drum and including blades mounted to occupy various angular positions with relation to the bottom of the drum, said blades being arranged in sets, and means for simultaneously adjusting the blades of either set to effect a concentration of the material at a point spaced from the periphery of the each embodying my invention, it is to be drum or a concentration of the material at the periphery of the drum.

4. A concrete mixer'comprising a drum mounted for tilting movement, a frame supporting the drum, a head rotatable within the drum and removable therefrom, mechanism for rotating said head, and mixing elements carried by said head, each of the elements comprising a bar secured to the head to occupy a.horizontal position within the drum, shafts rotatably mounted in the bar and arranged in sets, blades carried by each of the shafts and adapted to have a wiping contact with the bottom of the drum, and means for simultaneously rotating the shafts of either set independently of the shafts of the other set to effect an adjustment of said blades for the purpose described.

5. In a concrete mixer, a frame, wheel carrying stub axles rotatably fitted in the frame and supporting the latter, a mixing drum mounted for tilting movement upon the frame, a lever fulcrumed on the frame and engageable with one of the stub axles for maintaining one end of the frame in elevated position, and releasable means engageable with the lever for retaining the latter in engagement With the stub axle.

In testimony whereof I have signed my name to this specification.

GEO. A. BONELLI. 

